Smartgen BACM2420 User manual

BACM2420
BATTERY CHARGER
USER MANUAL
SMARTGEN (ZHENGZHOU) TECHNOLOGY CO., LTD.

Chinese trademark
English trademark
SmartGen —make your generator smart
SmartGen Technology Co., Ltd.
No.28 Jinsuo Road
Zhengzhou City
Henan Province
China
Tel: [phone]
0086-(0)371-67991553/67992951
0086-(0)371-67981000(overseas)
Fax: [phone]
Web: www.smartgen.com.cn
www.smartgen.cn
Email: [e-mail]
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Applications for the copyright holder’s written permission to reproduce any part of this publication
should be addressed to Smartgen Technology at the address above.
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SmartGen Technology reserves the right to change the contents of this document without prior notice.
Table 1 Software Version
Date
Version
Note
2016-11-24
1.0
Original Release
2017-03-01
1.1
BACM2420 configuration item added 24V/12V
self-adaption option.
2017-09-27
1.2
In “Parameters Specification” section, changed the
“Efficiency”parameter to “Max. Efficiency”.
2019-07-08
1.3
Fix case dimension size;

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CONTENT
1OVERVIEW........................................................................................................................................4
2PERFORMANCE AND CHARACTERISTICS...................................................................................4
3CHARGING PRINCIPLE ...................................................................................................................5
4PARAMETERS CONFIGURATION...................................................................................................7
5PARAMETERS SPECIFICATION......................................................................................................9
6OPERATION....................................................................................................................................11
7CONNECTION.................................................................................................................................12
8CASE DIMENSIONS .......................................................................................................................13

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1 OVERVIEW
BACM2420 battery charger is an intelligent and multi-function charger, which is specially
designed to meet the charging characteristics of the lead-acid engine starter batteries. It is suitable for
24V or 12V battery pack and the maximum output current is 20A.
2 PERFORMANCE AND CHARACTERISTICS
It has the following characteristics:
1) Switch power supply structure, wide AC voltage input range, small size, light weight, high
efficiency;
2) Users can select automatic two-stage charging process or automatic three-stage charging
process according to needs. Both two charging processes are carried out according to storage
battery charging characteristics, which can prevent overcharging and significantly prolong battery
lifetime;
3) Built-in PFC circuit, which allows to calibrate the power factor up to 0.99;
4) Battery voltage detection ports, which can detect the battery voltage at real time.
5) Battery low voltage output port; it will output low level immediately after the battery voltage has
fallen below the set value after preset delay.
6) Temperature sensor port, which allows monitoring the battery temperature at real time; and
temperature compensation function, which can prevent too high battery temperature effectively;
7) Mains failure alarm port; It will output low level when the AC input is interrupted;
8) Standard RS485 serial communication port.
9) Default suitable for 24V battery pack; it can be changed to 12V battery pack by changing
configuration information; rated charging current is 20A;
10) External LED status display: Full charged indication (Green light) and charging indication (Red
light).

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3 CHARGING PRINCIPLE
Fig. 1 Three-stage Charging Curve
Three-stage charging method is used according to the battery charging characteristics.
1) The first stage is named "constant current". a): Trickle Charge: when the battery terminal voltage
is relatively low, the charging current is low likewise, which effectively prevents battery damage
from too high temperature. The charging indicator (Red color) status is illuminated. b): Quick
Charge: When the battery terminal voltage is relatively high, the charging current will rise to rated
value. Large current charging operation leads to an rapid increase in the electrical quantity of the
battery. The charging indicator (Red color) status is flashing rapidly (0.2s/per).
2) The second stage is named "absorption charge". After the first stage, the battery voltage rises to
absorption charge value rapidly, and the charger voltage will keep constant. The battery terminal
voltage will stabilize in the absorption charge value with the decreasing of charging current. The
charging indicator (Red color) status is flashing slowly (1s/per).
3) The third stage is named "float charge": After the above two stages, the charging is basically
completed and charger output voltage changes to float voltage automatically. Charging current
decreases to floating charging current. Red charging indication is extinguished. Green full
charging indication is illuminated. Afterwards charging current neutralizes self-discharge of the
battery. Even long-term charging doesn't do harm to the battery. That is, charger not only can
keep the battery fully charged but also guarantee long lifetime of the battery.

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Fig. 2 Two-stage Charging Curve
Two-stage charging method is performed according to the battery charging characteristics.
1) The first stage is named "constant current". a): Trickle Charge: when the battery terminal voltage
is relatively low, the charging current is low likewise, which can prevent battery damage from too
high temperature. The charging indicator (Red color) status is illuminated. b): Quick Charge:
When the battery terminal voltage is relatively high, the charging current will rise to rated value.
Large current charging operation leads to a rapid increase in the electrical quantity of the battery.
The charging indicator (Red color) status is flashing rapidly (0.2s/per).
2) The second stage is named "float charge". The charging current will decrease with the rising of
battery electricity. The charging indicator (Red color) status is flashing slowly (1s/per). As soon
as charging current value falls below 0.3A, the battery is basically fully charged (Red indicator will
extinguish and the green indicator will be illuminated). After that charging current will only
neutralize the battery self-discharge. Even long-term charging cannot harm the battery, as
charger can keep the battery fully charged and also guarantee long lifetime of the battery.
Table 2 Charging Indicator Status
Mode
Indicator
Charging Status
Constant Current
Constant
Voltage
Float Charge
Charge Failure
Trickle
Charge
Quick
Charge
Two
Stage
Red
On
Flash(Rapidly)
None
Flash(Slowly)→Off
Flash(Rapidly)
Green
Off
Off
None
Off→On
Flash(Rapidly)
Three
Stage
Red
On
Flash(Rapidly)
Flash(Slowly)
Off
Flash(Rapidly)
Green
Off
Off
Off
On
Flash(Rapidly)

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4 PARAMETERS CONFIGURATION
Table 3 Parameter Configuration List
Items
Default
Adjustable Range
Description
24V
12V
24V
12V
Battery Type
1
(0~2)
0:12V；1:24V；2:Self-adaption
Charging Stage
3
(2~3)
2: Two Stage; 3: Three Stage
Max. Rated
Current
20.0A
Nonadjustable
Maximum charging current
Rated Current
100%
(0~100)%
Maximum charging current
percentage
Absorption
Charge Voltage
28.2V
14.1V
(20~30)V
(10~15)V
The charging voltage of “Constant
Voltage”
Absorption
Charge Time
1
(0~1)
0: Disable; 1: Enable
Absorption
Charge Time
Setting
1.0h
(0.1~100)h
The charging time of “Constant
Voltage”
Absorption
Charge Complete
Current
1
(0~1)
0: Disable; 1: Enable
Complete Current
Setting
0.5A
(0.20~3.00)A
The transition current from
“Absorption Charge” transfer to
“Float Charge”.
Float Charge
Voltage
27.0V
13.5V
(20~30)V
(10~15)V
The voltage of “Float Charge”
AUTO BOOST
Voltage
25.6V
12.8V
(20~30)V
(10~15)V
When the charger is in “Float
Mode”, it enters into “Quick
Charge” if the battery voltage has
fallen below the set value.
Trickle Charge
1
(0~1)
0: Disable; 1: Enable
Trickle Charge
Voltage
22.0V
11.0V
(20~30)V
(10~15)V
The voltage of “Trickle Charge”
Trickle Charge
Current
50%
(0~100)%
Maximum charging current
percentage
Battery Detection
0
(0~1)
0: Disable; 1: Enable
Battery Under
Voltage Warn
1
(0~1)
0: Disable; 1: Enable
Under Voltage
Set Value
23.0V
11.50V
(16.0~30.0)V
(8.0~15.0)V
“Under voltage” alarm will be
initiated if the battery voltage has
fallen below the set value.
Under Voltage
Delay
120s
(0~3600)s
“Under voltage” alarm will be
initiated if the battery voltage has
fallen below the set value and the
delay timer has expired.
Under Voltage
Return Value
24.0V
12.0V
(16.0~30.0)V
(8.0~15.0)V
The transition voltage from “under
voltage” transfer to “normal
voltage”.
Under Voltage
Return Delay
10s
(0~3600)s
“Under voltage” alarm will be
removed if the battery voltage has
exceeded the return value and the
delay timer has expired.
Temperature
Sensor
1
(0~1)
0: Disable; 1: Enable
Temperature
1
(0~1)
0: Disable; 1: Enable

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Items
Default
Adjustable Range
Description
24V
12V
24V
12V
Compensation
Temperature
Compensation
Set Value
0.036
V/℃
0.018
V/℃
(0.020~0.060)
V/℃
(0.010~0.030)
V/℃
The Compensation of every 1℃
change on 20℃basis.
High Temp. Warn
1
(0~1)
0: Disable; 1: Enable
High Temp. Set
Value
55℃
(0~80)℃
“High Temp.” alarm will be
initiated if the battery temperature
has exceeded the set value.
High Temp. Delay
0.5s
(0~60.0)s
“High Temp.” alarm will be
initiated if the battery
temperature has exceeded the
set value and the delay timer
has expired.
High Temp.
Return Value
50℃
(0~80)℃
The transition temperature from
“High Temp.” transfer to “Normal
Temp.”.
High Temp.
Return Delay
1s
(0~60.0)s
“High Temp.” alarm will be
removed if the battery
temperature has fallen below
the return value and the delay
timer has expired.
Auxiliary Input
Port
3
(0~4)
0、Not Used；
1、Shutdown：The battery
charger enters into Standby
Status if the input is active.
2、Enable Battery Detection：
The battery charger enters into
Standby Status if the input is
active but there is not battery
voltage signal.
3、Manual BOOST:
The battery charger enters into
BOOST if the input is active.
4、12V system: if input is active,
charger will be in 12V system.
Auxiliary Input
Port Delay
2.0s
(0~60.0)s
The corresponding action will
be active if the input is active.
Communication
Address
10
1~254
RS485 Communication
Address
Baud Rate
0
(0~2)
0、9600；1、19200；
2、38400 (One Stop Bit)

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5 PARAMETERS SPECIFICATION
Table 4 Product Parameters
Items
Contents
Parameters
24V
12V
Input
Characteristics
Nominal AC
Voltage Range
AC (100~277)V
Max. AC
Voltage Range
AC (90~305)V
AC Frequency
50Hz/60Hz
Max. Active
Power
680W
340W
Max. Current
7A
3.5A
Max. Efficiency
87%
81%
Power Factor
Calibration
AC 110V
AC 220V
AC 110V
AC 220V
>0.99
>0.95
>0.99
>0.95
Output
Characteristics
No-load Output
Voltage
27V，Error±1%
13.5V, Error±1%
Rated
Charging
Current
20A，Error±2%
Max. Output
Power
580W
290W
Insulating
Property
Insulation
Resistance
Between input and output, input and shell all areDC500V1min,:
insulation resistance RL≧50MΩ
Insulation
Voltage
Between input and output, input and shell all are: AC1600V
50Hz 1min
leakage current: IL≦3.5mA
Between output and shell is: AC500V 50Hz 1min
leakage current: IL≦3.5mA
Working
Condition
Working
Temperature
(-30~+55)°C
Storage
Temperature
(-40~+85)°C
Working
Humidity
20%RH~93%RH(No condensation)
Shape Structure
Weight
2.2kg
Dimension
265mm×156mm×68mm (length*width*height)

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Fig. 3 Efficiency Curve

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6 OPERATION
Fig. 4 BACM2420 Mask
Table 5 Wiring Connections
Terminal
Function
Description
L
AC Input Terminals
Connect terminals L and N to AC (100~240)V;
Bigger than BVR 2.0mm2multi-strand copper line
is recommended.
N
PE
GND Terminals
Connect to shell internally.
A(+)
RS485 Communication Port
Standard RS485 serial communication interface
B(-)
MF
Mains Failure Output Port
It will output low level immediately when the AC
input is interrupted.
IN
Auxiliary input port
Low level is active.
BV
Battery Voltage Port
Connect to battery positive.
COM
Common Port
COM port of BV and temperature acquisition
terminal. Connect to battery negative.
BT
Temperature Sensor Port
Connect to PT1000 sensor
BLV
Battery Low Voltage Alarm
Output Port
It will output low level when the battery voltage has
fallen below the set value.
B-
Battery Negative
Connect to battery negative; Bigger than BVR
2.0mm2multi-strand copper line is recommended.
B+
Battery Positive
Connect to battery positive; Bigger than BVR
2.0mm2multi-strand copper line is recommended.
FULL
CHARGED
Green LED Indicator
Full charged Indicator
CHARGING
Red LED Indicator
Charging status Indicator
NOTE:
1) Because there is diode and current-limiting circuit inner the charger, it can be used together with
charging generator, and there is no need to disconnect the charger when cranking.
2) During genset is running, high current will cause voltage drop in charging line, so recommend
separately connecting to battery terminal to avoid disturbance on sampling precision.

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7 CONNECTION
Fig. 5 Wiring Diagram

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8 CASE DIMENSIONS
Fig. 6 BACM2420 Installation Size
_________________________________
Unit: mm